22018446 has 32 divisors (see below), whose sum is σ = 49766400. Its totient is φ = 7214040.

The previous prime is 22018433. The next prime is 22018471. The reversal of 22018446 is 64481022.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270 + ... + 6641.

It is an arithmetic number, because the mean of its divisors is an integer number (1555200).

Almost surely, 2^22018446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22018446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24883200).

22018446 is an abundant number, since it is smaller than the sum of its proper divisors (27747954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22018446 is a wasteful number, since it uses less digits than its factorization.

22018446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981 (or 6975 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 22018446 is about 4692.3816980293. The cubic root of 22018446 is about 280.2822239423.

Adding to 22018446 its reverse (64481022), we get a palindrome (86499468).

The spelling of 22018446 in words is "twenty-two million, eighteen thousand, four hundred forty-six".